The "Hershey" help page states:
If the 'vfont' argument to one of the text-drawing functions
('text', 'mtext', 'title', 'axis', and
'contour') is a character
vector of length 2, Hershey vector fonts are used to render the
text.
However, title() issues warnings and does not use the vfont information if
provided:
> title(main="test",vfont=c("sans
serif","bold"))
NULL
Warning message:
parameter "vfont" couldn't be set in high-level plot() function
>
-Greg
Gregory R. Warnes
Manager, Non-Clinical Statistics
Pfizer Global Research and Development
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